Improvement in extractors for metal-screw machrnes



m w m UNITED STATES PATENT OFnIon.

HENRY S. LANSDELL, OF BROOKLYN, NEW YORK.

Specification forming part of Letters Patent No. 222,059, dated November25, 1879; application filed September 18,1877.

To all whom it may concern:

Be it known that I, HENRY S. LANSDELL, of Brooklyn, in the county ofKings and State of New York, have invented a new and useful Improvementin Devices for Extracting or Bemoving Screws in Screw-Cutting Machines,of which the following is a description, reference being had to theaccompanying drawings, forming part of this specification.

My invention relates to machines of various kinds for making metalscrews, but is more particularly designed to be applied to screwcuttingmachines in which an intermittentlyrevolving head having dies in itsopposite sides arranged to rotate in reverse directions is used, so thatwhile a screw-thread is being out upon one blank at oneside of the heada finished screw, ready for removal, is presented on the other side ofthe head. In such, as in other machines for a like purpose, the head ofthe screw has been nicked while in the machine, whereby a mere slidingscrew-driver might be used in connection with the rotating die toextract the screw from the machine. This nicking of the head of thescrew, however, in the same machine as cuts the thread racks thescrew-cutting mechanism, and is otherwise objectionable.

My invention provides for the extraction of the screw from the die bywhich its thread has been out without nicking the head of the screwwhile the latter is in the machine which cuts the thread or beforeintroducing it thereto.

The invention is especially designed to be applied to the machine formaking metal screws patented to N. O. Hubbell, No. 143,412, datedOctober 7, 1873.

To this end the invention consists in a screw-extractor of novelconstruction, in which the head of the screw is automatically clampedbetween jaws or gripers having a wedging action, and carried by a holderwhich is fitted to slide longitudinally in direction of the length ofthe screw, to remove the latter from the die as the latter is rotated ina suitable direction, or when the die is stationary, as said extractoris rotated as well as slid away from the die.

Figure 1 represents a front elevation of a screw-extractor constructedaccording to my invention, and Fig. 2 a top view ofthe same.

A is the holder or frame of the extractor, attached to alongitudinally-sliding bar or shaft, B, thecenter of which is in linewith the center of the screw in the threadcuttin g die when the latteris brought into position for removing the screw from said die-as, forinstance, by the intermittent rotation of a duplicate or many dieholding head. This holder or frame A is provided on its face with agriper or jaw, O, pivoted, as at 12, below and to one side of the shaftB or working centerof the holder, (represented by the aperture 0,) bywhich the holder or frame A is secured on said shaft. Said griper or jawis straight on its acting surface or face d, which, in the swinging ofsaid griper, crosses the aperture 0 with a wedgelike action relativelyto a stationary jaw or griper, D, on the opposite side of said aperture. This stationary jaw or griperDis formed with a shank, 6,adjustable in a socket, f, on

the face of the holder, to regulate the biting or bearing surface ofsaid jaw D relatively to the center of the aperture 0 or shaft B, toprovide for the extractors operation on screwheads of differentdiameters, in order that the screw E, being extracted, may be concentricwith the longitudinally-sliding center of the holder A.

A weight or weighted lever, G, attached to the pivot b of the movablejaw 0, serves to close with a wedge-like action the jaw or griper O onthe head of the screw E, and to hold the lat-ter between the jaws O andD from turning while the holder A is sliding backward and the die isunscrewing itselffrom off the screw, in or during which the gripe of thejaws is increased by the rotation of the die relatively to the closingaction of the jaw or griper C.

To enter the screw E between the jaws G and D, its head, in cominground, strikes the lower portion of the faced of the movable jaw O, and,lifting the weighted lever G, which may be adjustable to give a variableefi'ect, liberates the screw previously held by the extractor, andcauses the new screw to be entered between the jaws O and D, and to befirmly held by the wedging or closing action of the jaw C while theholder A is run back to extract the screw from the die.

- When the screwing-die is stationary and the holder or frame A isrotated as well as slid longitudinally in direction of the length of thescrew to extract the latter, then, instead of the weighted lever G, aspring may be used to close the movable griper.

I claim A 1. The screw-extractor com posed of a holder or frame, A, apivoted or movable self-closing jaw or griper, B, controlled by a springor weight, and arranged on one side of said holders working center, anda stationary jaw or griper, D, on the opposite side of said center, foroperation in relation with a screwing die or dies, substantially asspecified.

2. The stationary jaw or griper D, made adjustable relatively'to theworking center of the holder or frame A, which carries said jaw, incombination with the pivoted or movable selfclosing jaw O and the holderor frame A, essentially as and for the purpose herein set forth.

3. The combination, for use with a movable die-holder carrying one ormore dies adapted to cut a thread upon the screw, of jaws with serratedfaces for gripin g the head of a screw and holding the same stationarywhile the die containing it is unscrewing or reversing, the said jawsbeing carried by a sliding head, which moves back as the screw isgradually projected from the die.

HENRY S. LANSDELL.

Witnesses FRED. HAYNES, BENJAMIN W. HOFFMAN.

